A bumbling Nassau County Police Department employee brought mounds of shredded sensitive documents to the Macy’s Thanksgiving Day Parade last week and tossed it as confetti, sources told The Post.

An office staffer took the shredded documents from a precinct house and brought them to the annual bash to toss along with other revelers at the beginning of the parade, a source said.

It’s unclear if the employee is a cop or a civilian worker.

Internal-affairs investigators know who took the paperwork and are considering punitive action, sources said.

Stunned paradegoers noticed that the confetti contained the names of police officers, Social Security numbers, license- plate numbers and information relating to other people involved in police business.

Some of the paperwork even discussed details of Mitt Romney’s visit to Hofstra University in October for a presidential debate.

Investigators came to Manhattan yesterday to visited one of the paradegoers who found the documents; they retrieved piles of shredded paper.

A Nassau County spokesman would not comment yesterday, but said the department is investigating the issue and reviewing their document-removal procedures.